Analytical Methods
·
2023
·Vol. 15
·期 23
·2868-2875
·
IF 3.1
Xia Gao,Guo Yu,Xuehan Liu,Yinlan Xu,Pengbo Zhang,Weidong Wu
Ozone (O3) is ubiquitous in the environment and exposure to high levels of O3 has been associated with various respiratory diseases, such as asthma, emphysema, and bronchitis. Therefore, it is necessary to develop a simple and efficient detection method for monitoring O3 in the environment and living cells. In this study, an intramolecular charge-transfer (ICT) compound was designed and synthesized based on a phenol-type hemicyanine dye and 4-bromo-1-butene, which could specifically detect O3 in aqueous solution. Due to the ICT process, the absorption spectrum, fluorescence spectrum, and color of the probe hemicyanine-butyl-3-enyl (HCB) changed significantly and thus the rapid and sensitive detection of O3 was realized. The interaction between O3 and the probe HCB could be completed within 40 min, and the detection limit of O3 was as low as 2.15 × 10−7 mol L−1. Finally, the proposed method was successfully applied to the visual detection of O3 in a simulated O3 environment and living cells.
研究领域:
环境科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2026
·
IF 4.5
Yu Fang,Qi Shi,Jinping Qu,Xiang Lu
Efficiently integrating solar and ambient thermal energy within a single molecular system remains a significant challenge. Here we systematically construct a family of azobenzene-based molecules in which photoisomerizable cores are covalently coupled with thermally active alkyl and alkenyl segments. Unlike previous studies focusing on isolated examples, our approach establishes a homologous molecular series that enables direct correlation between structural parameters and dual-mode energy storage behavior. Upon ultraviolet irradiation, the trans -cis isomerization induces lattice disorder and photo‐liquefaction, allowing simultaneous capture of photon energy and latent heat. The reverse process triggered by light or heat releases both chemical and phase-change enthalpies in a single synergistic step. The system exhibits a gravimetric energy density exceeding 300 J g −1 , demonstrating a competitive performance among reported materials. Combined density functional theory and calorimetric analyses quantitatively link the isomerization energetics with crystal packing variations, establishing a predictive relationship between molecular design and thermophysical performance. This systematic strategy provides a data-driven framework for designing programmable photothermal materials and paves the way for high-throughput molecular energy computation.
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Ming Li,Ruixia Liu,Qi Liu,Ying Liu,Yifan Liu,Qian Su,Yunong Li,Zifeng Yang
Heterogeneous ionic liquid (IL) catalysts with multiple active sites can be considered as the highly efficient catalyst for CO 2 conversion to cyclic carbonates. It is extremely challenging to achieve the strategic design and precise control of multi-site polymeric ILs’ morphology and properties. In this work, we developed a novel and facile polymerization-ionization method employing flexible brominated monomers as raw materials ( e.g. 4‑bromo-1-butene) to successfully synthesize porous hyper-cross-linked phosphonium bromide-microspheres (PBr-microspheres), in order to break through the drawbacks of multi-step preparation and difficulty in microsphere forming. Compared with conventional bromine spheres of the same size, the specific surface area of the new synthetic bromine sphere is 16 times, and the average pore size is one-eighth, with 3-times CO 2 adsorption capacity, with rich microporous structure and exposed active sites, excellent CO 2 adsorption capacity and thermal stability. PBr-microspheres can achieve synergistic effect of physical adsorption and chemical interaction for CO 2 , thus enhancing the catalytic performance in CO 2 conversion process, affording propylene oxide conversion of 99.7 % and propylene carbonate selectivity of 99.9 %, while the catalytic activity did not decrease significantly after reusing 8 runs. This facile controllable synthesis of PBr-microspheres with excellent catalytic performance provides a new idea for heterogeneous ILs-catalyzed CO 2 utilization.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2020
·Vol. 221
·期 11
·2000071
·
IF 2.335
Xiuxiu Wang,Nan Zhao,Ban Qin,Jiaojiao Xu,Wenlong Yang,Chensha Li,Liguo Sun,Jianqi Zhang
For the first time, an ultrasonics sonochemistry method is developed to promote the one-pot hydrosilylation polyaddition polymerization and crosslinking reaction in the preparation of polysiloxane main-chain liquid-crystalline elastomers (MC-LCEs). Due to the extraordinary effect of acoustic cavitation, the polyaddition polymerization and crosslinking reaction can be successfully carried out in an ordinary laboratory ultrasonic cleaner at room temperature, and generates the LCE matrix network in about 30 min. The prepared MC-LCEs demonstrate good quality, good properties, and stimuli-actuation performances. Compared to the traditional thermal processing methods for preparing polysiloxane MC-LCEs, this method exhibits superior properties rapidly, with high convenience and efficiency, and can be a path for batch fabrication at low cost. The work also demonstrates that the ultrasonics sonochemistry method is effective in generating linear main-chain liquid crystal polymers through hydrosilylation polyaddition and polysiloxane side-chain LCE matrix through hydrosilylation crosslinking reaction, thus confirming the high availability of ultrasonics sonochemistry in the processes of hydrosilylation polymerization, crosslinking reactions, or synchronous polymerization and crosslinking reactions.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Shengbo Zhu,Jin Chigan,Wei Li,Jingyu Yang,Weixing Chen,Wenzhi Zhang,Xiaoling Niu,Xinbing Chen,Zhongwei An
Two series of alkenoxy-biphenyl compounds have been synthesized and characterized for investigating the relationship between intermolecular actions ( e.g. , π-π stacking, dipole-dipole interactions, and van der Waals interactions) and the mesomorphic properties. Firstly, their mesophases were determined by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD). Then, Density Functional Theory (DFT) calculations, UV absorption spectra and fluorescence (FL) emission spectra were also conducted to assist in analyzing their mesomorphic properties. The results show that the type and stability of liquid crystal mesophases are dependent on the intermolecular actions. Moreover, suitably modifying intermolecular actions by the terminal groups has been proved to be an effective approach to regulate the formation and stability of nematic/smectic mesophases.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2022
·Vol. 18
·期 6
·1264-1274
·
IF 4.046
Nan Zhao,Xiuxiu Wang,Liru Yao,Huixuan Yan,Ban Qin,Chensha Li,Jianqi Zhang
Liquid crystalline elastomer (LCE) materials have been developed and investigated for several decades. One important obstacle, which impedes the practical industrial application of LCE materials, is their modest robustness as actuator materials. In this work, we developed a LCE composite which was fabricated by incorporating eiderdown fibers into a polysiloxane-based main-chain LCE matrix. The eiderdown fibers were used as the flexible reinforcement phase suitable for the shape-morphing performance of LCE materials upon being stimulated. Due to the long fiber property, specific structure and surface characteristics of the eiderdown fibers, they constructed a reinforcement network in the LCE matrix and formed tight interfacial adhesion with the matrix. The LCE composite demonstrated enhanced actuation mechanical properties and robust actuation performance. Its actuation blocking stress and modulus were increased due to the reinforcement effect of the eiderdown fibers. The tensile strength and the performance of anti-fatigue failure under repeated actuation cycles and high loadings were greatly improved due to the crack-resisting effect and bridging effect of the eiderdown fibers. While other properties, such as the liquid crystalline phase structure, the stimulus deformation ratio, phase transition temperature of the LCE matrix, etc., did not deteriorate or change due to the high flexibility, thermal stability and chemical stability of the eiderdown fibers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Mi Wang,Zhenyuan Wang,Jichuan Zhang,Teng Fei,Jiaheng Zhang
Hypergolic ionic liquids (ILs) are a feasible green alternative to the toxic and volatile hydrazine-based fuel in propellant systems. However, most reported hypergolic ILs still have environmental and biological issues due to their petrochemical product sources. Theophylline is a plant-derived methylxanthine-type alkaloid with relatively high energy density. This work synthesizes a novel family of bio-renewable theophylline-derived cations for energetic ionic compounds, with dicyanamide as the hypergolic anion. Five with shorter cationic alkyl groups (less than or equal to four carbon atoms) exhibit spontaneous combustion upon contact with 100 % HNO 3 . Meanwhile, they possess high densities above 1.30 g·cm −3 , and density-specific impulses varied in the range of 333.2–348.0 s·g·cm −3 (calculated by Gaussian 09 program), better than those of the hydrazine-based propellants. Notably, 9-butenyl-1,3,5-trimethylxanthinium dicyanamide exhibits excellent integrated properties, including the shortest ignition delay time (49 ms), most comprehensive liquid operating temperature range (−70 to 215 °C), and a high density-specific impulse (342.2 s·g·cm −3 ). This study is expected to pave the way for developing bio-renewable hypergolic ILs from natural sources.
研究领域:
化学工程
·
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Xiaofeng Wan,Xiangtai Wei,Jinming Ge,Lingfeng Lu,Ziqiang Liu,Yuanqin Zhu
High hydroxide conductivity and sufficient dimensional/alkaline/mechanical stability are highly desired for practical applications of anion exchange membranes (AEMs). Herein, a new di -quaternized side-chain precursor (EDQA) was firstly designed and synthesized. Then novel AEMs (DBTF-4QA-x) based on poly(fluorenylene alkylene)s containing dual Y-shaped side-chains were prepared from EDQA by an efficient click reaction. Benefiting from several structural advantages of EDQA, DBTF-4QA-x membranes possessed high hydroxide conductivities up to 154.8 mS cm −1 at 80 °C, while maintained high dimensional stability. The membranes exhibited robust mechanical properties with tensile strengths and elongation at break up to 107.4 MPa and 46.4%, respectively. Furthermore, the membranes showed high alkaline stability with the conductivity loss below 11.4% after immersing in 4 M aq. NaOH at 80 °C for 40 days. In addition, DBTF-4QA-0.5 membrane achieved the maximum peak power density of 836.4 mW cm −2 in H 2 /O 2 fuel cells at 60 °C.
研究领域:
材料科学
·
化学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）